KR950030507A - A transmission power control method in a code division multiple access system and a mobile station using the transmission power control method - Google Patents

A transmission power control method in a code division multiple access system and a mobile station using the transmission power control method Download PDF

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KR950030507A
KR950030507A KR1019950010659A KR19950010659A KR950030507A KR 950030507 A KR950030507 A KR 950030507A KR 1019950010659 A KR1019950010659 A KR 1019950010659A KR 19950010659 A KR19950010659 A KR 19950010659A KR 950030507 A KR950030507 A KR 950030507A
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base station
transmit power
mobile station
sir
power control
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KR100235855B1 (en
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도모히로 도히
꼬지 오노
마모루 사와하시
아끼히로 히가시
나루미 유메다
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고지 오보시
엔.티.티 이도오쓰으신모오 가부시끼가이샤
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/18TPC being performed according to specific parameters
    • H04W52/24TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/08Reselecting an access point
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/38TPC being performed in particular situations
    • H04W52/40TPC being performed in particular situations during macro-diversity or soft handoff
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/16Performing reselection for specific purposes
    • H04W36/18Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection

Abstract

소프트 핸드오프가 행해지는 동안 고도로 정밀한 송신 전력 제어를 하므로써 송신 전력을 감소시켜 가입자수에 의한 용량의 증가가 가능해지는 CDMA에서 송신 전력 제어 방법이다. 이동국은 이전 기지국으로부터의 송신 전력 제어 비트와 새로운 기지국으로부터의 송신 전력 제어 비트를 비교하고 이동국의 송신 전력중 낮은 송신 전력을 나타내는 송신 전력제어 비트를 선택함으로써 이동국의 송신 전력을 결정한다. 이동국은 이전기지국으로부터의 수신 SIR과 새로운 기지국으로부터의 수신 SIR을 비교하여 더 큰 수신 SIR을 결정함으로써 기지국을 위한 송신 전력 제어 비트를 결정한다. 이 방법은 송신 전력을 감소시키고 가입자 수에 의하여 용량을 증가시킬 수 있다.It is a transmission power control method in CDMA in which the transmission power is reduced and the capacity can be increased by the number of subscribers by performing highly precise transmission power control during soft handoff. The mobile station determines the transmit power of the mobile station by comparing the transmit power control bits from the old base station with the transmit power control bits from the new base station and selecting the transmit power control bits that represent the lower transmit power of the transmit power of the mobile station. The mobile station determines the transmit power control bits for the base station by comparing the received SIR from the old base station with the received SIR from the new base station to determine the larger received SIR. This method can reduce transmission power and increase capacity by the number of subscribers.

Description

코드 분할 다중 접속 시스템에서의 송신 전력 제어 방법 및 그 송신전력 제어 방법을 이용한 이동국A transmission power control method in a code division multiple access system and a mobile station using the transmission power control method

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제3도는 본 발명에 따른 제1 송신 전력 제어 방법을 설명하는 개략적인 다이어그램, 제4도는 본 발명에 따른 제2 송신 전력 제어 방법을 설명하는 개략적인 다이어그램, 제5도는 본 발명에 따른 제3 송신 전력 제어 방법을 설명하는 개략적인 다이어그램, 제6도는 본 발명에 따른 제3 송신 전력 제어 방법이 적용되는 이동국의 실시예를 나타내는 블럭 다이어그램.3 is a schematic diagram illustrating a first transmission power control method according to the present invention, FIG. 4 is a schematic diagram illustrating a second transmission power control method according to the present invention, and FIG. 5 is a third transmission according to the present invention. 6 is a block diagram illustrating an embodiment of a mobile station to which a third transmit power control method according to the present invention is applied.

Claims (12)

주파수 분할 다중 접속(CDMA) 시스템에서, 이동국과 이전 기지국간의 통신을 이동국과 새로운 기지국간의 통신으로 전환하는 소프트 핸드오프되는 동안의 송신 전력 제어 방법에 있어서, 상기 이동국에서, 상기 이전 기지국으로부터 전송된 수신 신호에서 상기 이동국의 송신 전력을 지정하는 제1송신 전력 제어 비트를추출하는 단계; 상기 이동국에서, 상기 새로운 기지국으로부터 전송된 수신 신호에서 상기 이동국의 송신 전력을 지정하는 제2송신 전력 제어 비트를 추출하는 단계; 상기 이동국에서, 상기 제1송신 전력 제어 비트에 의해 지정하는 송신 전력과 상기 제2송신 전력 제어 비트에 의해 지정하는 송신 전력을 비교하는 단계; 상기 이동국에서, 상기 제1송신 전력 제어 비트와 상기 제2송신 전력 제어 비트중에서 하나를 선택하되, 낮은 송신 전력을 지정하는 송신 전력 제어 비트를 선택하는 단계; 및 상기 이동국에서, 상기 선택된 송신 전력 제어 비트에 따라 상기 이동국의 송신 전력을 제어하는 단계를 포함하는 것을 특징으로 하는 송신 전력 제어 방법.A method for controlling transmission power during soft handoff in a frequency division multiple access (CDMA) system that switches communication between a mobile station and an old base station to communication between a mobile station and a new base station. Extracting from the signal a first transmit power control bit that specifies the transmit power of the mobile station; Extracting, at the mobile station, a second transmit power control bit that designates the transmit power of the mobile station from the received signal transmitted from the new base station; Comparing, at the mobile station, a transmit power designated by the first transmit power control bit and a transmit power designated by the second transmit power control bit; At the mobile station, selecting one of the first transmit power control bit and the second transmit power control bit, wherein the transmit power control bit designates a low transmit power; And controlling, at the mobile station, the transmit power of the mobile station in accordance with the selected transmit power control bit. 제1항에 있어서, 상기 이동국은, 동일한 확산 코드와 동일한 송신 주파수, 다른 확산 코드들과 동일한 송신 주파수, 동일한 확산 코드와 다른 송신 주파수들 및, 다른 확산 코드들과 다른 송신 주파수들의 조합중 하나를 사용함으로써 상기 이전 기지국과 상기 새로운 기지국과 함께 소프트 핸드오프를 실행하는 것을 특징으로 하는 송신 전력 제어 방법.2. The mobile station of claim 1, wherein the mobile station selects one of the same spreading code and the same transmission frequency, the same spreading code as the other spreading codes, the same spreading code and other transmit frequencies, and a combination of different spreading codes and different transmit frequencies. Transmitting soft handoff with the old base station and the new base station. 제1항에 있어서, 상기 이동국에서, 간섭에 대한 상기 이전 기지국으로부터의 수신 신호의 제1 SIR(singnal-to-interference ratio : 신호대 간섭비)를 측정하는 단계; 상기 이동국에서, 간섭에 대한 상기 새로운 기지국으로부터의 수신 신호의 제2 SIR을 측정하는 단계; 상기 이동국에서, 상기 제1 SIR과 상기 제2 SIR을 비교하는 단계; 상기 이동국에서, 상기 제1 SIR과 상기 제2 SIR중에서 하나를 선택하되, 다른 것보다 큰 SIR을 선택하는 단계; 상기 이동국에서, 선택된 SIR에 따라 상기 이전 기지국 및 상기 새로운 기지국의 송신 전력을 결정하기 위하여 제3 송신 전력 제어 비트를 결정하는 단계; 및 상기 선택된 송신 전력 제어 비트에 따라 제어된 송신 전력으로 상기 제3 송신 전력 제어 비트를 상기 이동국에서 상기 이전 기지국 및 상기 새로운 기지국으로 전송하는 단계를 더 포함하는 것을 특징으로 하는 송신 전력 제어 방법.2. The method of claim 1, further comprising: measuring, at the mobile station, a first single-to-interference ratio (SIR) of a received signal from the previous base station for interference; Measuring, at the mobile station, a second SIR of a received signal from the new base station for interference; Comparing, at the mobile station, the first SIR and the second SIR; At the mobile station, selecting one of the first SIR and the second SIR, wherein the SIR is greater than the other; Determining, at the mobile station, a third transmit power control bit to determine transmit power of the old base station and the new base station according to the selected SIR; And transmitting the third transmit power control bit from the mobile station to the old base station and the new base station at a transmit power controlled according to the selected transmit power control bit. 제3항에 있어서, 상기 이동국은, 동일한 확산 코드와 동일한 송신 주파수, 다른 확산 코드들과 동일한 송신 주파수, 동일한 확산 코드와 다른 송신 주파수들 및, 다른 확산 코드들과 다른 송신 주파수들의 조합중 하나를 사용함으로써 상기 이전 기지국과 상기 새로운 기지국과 함께 소프트 핸드오프를 실행하는 것을 특징으로 하는 송신 전력 제어 방법.4. The mobile station of claim 3, wherein the mobile station selects one of the same spreading code and the same transmission frequency, the same spreading code as other spreading codes, the same spreading code and other transmit frequencies, and a combination of different spreading codes and different transmit frequencies. Transmitting soft handoff with the old base station and the new base station. 주파수 분할 다중 접속(CDMA) 시스템에서 이동국과 이전 기지국간의 통신을 이동국과 새로운 기지국간의 통신으로 전환하는 소프트 핸드오프되는 동안의 송신 전력 제어 방법에 있어서, 상기 이동국에서, 간섭에 대한 상기 이전 기지국으로부터 수신 신호의 제1 SIR을 측정하는 단계; 상기 이동국에서, 간섭에 대한 상기 새로운 기지국으로부터의 수신 신호의 제2 SIR을 측정하는 단계; 상기 이동국에서, 상기 제1 SIR과 상기 제2 SIR을 비교하는 단계; 상기 이동국에서, 상기 제1 SIR과 상기 제2 SIR중에서 다른 것보다 큰 SIR을 선택하는 단계; 상기 이동국에서, 선택된 SIR에 따라 상기 이전 기지국 및 상기 새로운 기지국의 송신 전력을 결정하기 위하여 송신 전력 제어 비트를 결정하는 단계; 및 상기 송신 전력 제어 비트를 상기 이동국에서 상기 이전 기지국 및 상기 새로운 기지국으로 전송하는 단계를 포함하는 것을 특징으로 하는 송신 전력 제어 방법.A method for controlling transmit power during soft handoff that switches communication between a mobile station and an old base station to communication between a mobile station and a new base station in a frequency division multiple access (CDMA) system, the mobile station receiving from the previous base station for interference. Measuring a first SIR of the signal; Measuring, at the mobile station, a second SIR of a received signal from the new base station for interference; Comparing, at the mobile station, the first SIR and the second SIR; Selecting, at the mobile station, an SIR that is greater than the other of the first SIR and the second SIR; Determining, at the mobile station, a transmit power control bit to determine transmit power of the old base station and the new base station according to the selected SIR; And transmitting the transmit power control bits from the mobile station to the old base station and the new base station. 제5항에 있어서, 상기 이동국은, 동일한 확산 코드와 동일한 송신 주파수, 다른 확산 코드들과 동일한 송신 주파수, 동일한 확산 코드와 다른 송신 주파수들 및, 다른 확산 코드들과 다른 송신 주파수들의 조합중 하나를 사용함으로써 상기 이전 기지국과 상기 새로운 기지국과 함께 소프트 핸드오프를 실행하는 것을 특징으로 하는 송신 전력 제어 방법.6. The mobile station of claim 5, wherein the mobile station selects one of the same spreading code and the same transmission frequency, the same spreading code as other spreading codes, the same spreading code and other transmit frequencies, and a combination of different spreading codes and different transmit frequencies. Transmitting soft handoff with the old base station and the new base station. 주파수 분할 다중 접속(CDMA) 시스템에서 이동국과 이전 기지국간의 통신을 이동국과 새로운 기지국간의 통신으로 전환하는 소프트 핸드 오프되는 동안의 송신 전력 제어를 수행하는 이동국에 있어서, 상기 이전 기지국으로부터 전송된 수신 신호에서 상기 이동국의 송신 전력을 지정하는 제1송신 전력 제어 비트를 추출하기 위한 수단; 상기 새로운 기지국으로부터 전송된 수신 신호에서 상기 이동국의 송신 전력을 지정하는 제2송신 전력 제어 비트를 추출하기 위한 수단; 상기 제1 송신 전력 제어 비트에 의해 지정하는 송신 전력과 상기 제2송신 전력 제어 비트에 의해 지정된 송신 전력을 비교하기 위한 수단; 상기 제1 송신 전력 제어 비트와 상기 제2 송신 전력 비트중에서 하나를 선택하되, 낮은 송신 전력을 지정하는 송신 전력 제어 비트를 선택하기 위한 수단; 및 선택된 송신 전력 제어 비트에 따라 상기 이동국의 송신 전력을 제어하기 위한 수단을 포함하는 것을 특징으로 하는 이동국.A mobile station that performs transmission power control during soft handoff, which switches communication between a mobile station and an old base station to communication between a mobile station and a new base station in a frequency division multiple access (CDMA) system, comprising: Means for extracting a first transmit power control bit that specifies a transmit power of the mobile station; Means for extracting a second transmit power control bit specifying a transmit power of the mobile station from a received signal transmitted from the new base station; Means for comparing a transmit power specified by said first transmit power control bit with a transmit power specified by said second transmit power control bit; Means for selecting one of the first transmit power control bit and the second transmit power bit, wherein the transmit power control bit specifies a low transmit power; And means for controlling the transmit power of the mobile station in accordance with a selected transmit power control bit. 제7항에 있어서, 상기 이동국은, 동일한 확산 코드와 동일한 송신 주파수, 다른 확산 코드들과 동일한 송신 주파수, 동일한 확산 코드와 다른 송신 주파수들 및, 다른 확산 코드들과 다른 송신 주파수들의 조합중 하나를 사용함으로써 상기 이전 기지국과 상기 새로운 기지국과 함께 소프트 핸드오프를 실행하는 것을 특징으로 하는 이동국.8. The method of claim 7, wherein the mobile station comprises one of the same spreading code and the same transmission frequency, the same spreading code as the other spreading codes, the same spreading code and other transmit frequencies, and a combination of different spreading codes and different transmit frequencies. And perform a soft handoff with the old base station and the new base station. 제7항에 있어서, 상기 이동국은, 간섭에 대한 상기 이전 기지국으로부터의 상기 수신 신호의 제1 SIR을 측정하기 위한 수단; 간섭에 대한 상기 새로운 기지국으로부터의 상기 수신 신호의 제2 SIR을 측정하기 위한 수단; 상기 제1 SIR과 상기 제2 SIR을 비교하기 위한 수단; 상기 제1 SIR과 상기 제2 SIR중에서 하나를 선택하되, 다른 것보다 큰 SIR을 선택하기 위한 수단; 선택된 SIR에 따라 상기 이전 기지국과 상기 새로운 기지국의 송신 전력을 결정하기 위하여 제3 송신 전력 제어 비트를 결정하기 위한 수단; 및 상기 선택된 송신 전력 제어 비트에 따라 제어된 송신 전력으로 제3 송신 전력 제어비트를 상기 이동국에서 상기 이전 기지국 및 상기 새로운 기지국으로 전송하기 위한 수단을 더 포함하는 것을 특징으로 하는 이동국.8. The mobile station of claim 7, wherein the mobile station comprises: means for measuring a first SIR of the received signal from the previous base station for interference; Means for measuring a second SIR of the received signal from the new base station for interference; Means for comparing the first SIR with the second SIR; Means for selecting one of the first SIR and the second SIR, wherein the SIR is greater than the other; Means for determining a third transmit power control bit to determine transmit power of the old base station and the new base station according to the selected SIR; And means for transmitting a third transmit power control bit from the mobile station to the old base station and the new base station at a controlled transmit power in accordance with the selected transmit power control bit. 제9항에 있어서, 상기 이동국은, 동일한 확산 코드와 동일한 송신 주파수, 다른 확산 코드들과 동일한 송신 주파수, 동일한 확산 코드와 다른 송신 주파수들 및, 다른 확산 코드들과 다른 송신 주파수들의 조합중 하나를 사용함으로써 상기 이전 기지국과 상기 새로운 기지국과 함께 소프트 핸드오프를 실행하는 것을 특징으로 하는 이동국.10. The mobile station of claim 9, wherein the mobile station selects one of the same spreading code and the same transmission frequency, the same spreading code as the other spreading codes, the same spreading code and other transmit frequencies, and a combination of different spreading codes and different transmit frequencies. And perform a soft handoff with the old base station and the new base station. 주파수 분할 다중 접속(CDMA) 시스템에서 이동국과 이전 기지국간의 통신을 이동국과 새로운 기지국간의 통신으로 전환하는 소프트 핸드오프되는 동안의 송신 전력 제어를 수행하는 이동국에 있어서, 간섭에 대한 상기 이전 기지국으로부터의 수신 신호의 제1 SIR을 측정하기 위한 수단; 간섭에 대한 상기 새로운 기지국으로부터의 수신 신호의 제2 SIR을 측정하기 위한 수단; 상기 제1 SIR과 상기 제2 SIR을 비교하기 위한 수단; 상기 제1 SIR과 상기 제2 SIR중에서 하나를 선택하되, 다른 것보다 큰 SIR을 선택하기 위한 수단; 선택된 SIR에 따라 상기 이전기지국과 상기 새로운 기지국의 송신 전력을 결정하기 위하여 제3 송신 전력 제어 비트를 결정하기 위한 수단; 및 상기 송신 전력 제어 비트를 상기 이동국에서 상기 이전 기지국 및 상기 새로운 기지국으로 전송하기 위한 수단을 포함하는 것을 특징으로 하는 이동국.A mobile station that performs transmission power control during soft handoff that switches communication between a mobile station and an old base station to communication between a mobile station and a new base station in a frequency division multiple access (CDMA) system, the reception of interference from the previous base station. Means for measuring a first SIR of the signal; Means for measuring a second SIR of a received signal from the new base station for interference; Means for comparing the first SIR with the second SIR; Means for selecting one of the first SIR and the second SIR, wherein the SIR is greater than the other; Means for determining a third transmit power control bit to determine transmit power of the previous base station and the new base station according to the selected SIR; And means for transmitting the transmit power control bits from the mobile station to the old base station and the new base station. 제11항에 있어서, 상기 이동국은, 동일한 확산 코드와 동일한 송신 주파수, 다른 확산 코드들과 동일한 송신 주파수, 동일한 확산 코드와 다른 송신 주파수들 및, 다른 확산 코드들과 다른 송신 주파수들의 조합중 하나를 사용함으로써 상기 이전 기지국과 상기 새로운 기지국과 함께 소프트 핸드오프를 실행하는 것을 특징으로 하는 이동국.12. The mobile station of claim 11, wherein the mobile station comprises one of the same spreading code and the same transmit frequency, the same spreading code as the other spreading codes, the same spreading code and other transmit frequencies, and a combination of different spreading codes and different transmit frequencies. And perform a soft handoff with the old base station and the new base station. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
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